Hair drier



L. J. WAHL HAIR DRIER Jue 9, 1931.|

Filed Sept. 20, 1929 y VPatented June 9, 19.31

'ino J. wam., or

f UNITED .STATES PATENT oFF-lcs STERLING, ILLIN0IS,IA CORPORATION 0F ILLINOS mummia Application led September 20,1929; -Serial No. `393,932.

My invention relates to electric hair drier's and has for its object certain improvements in such desi s whereby to enable them to more proper y perform their function.

heating element and fan which, in addition to' its function of protecting the user from contact with the heating element and fan, serves an additional purpose of preventin overheating due to the heating element m case they heater or motor, or both, is ma e simple l the outlet from the fan is closed.4

My invention also contemplates a novel control means for the motor and heating element whereby the starting and sto ping of and safe. I will describe one form which my invention may take b reference to the accompanying drawings w ere: y

Figure 1 is a side view partly insection of the hair drier;

Figure 2 is a rear end view ofthe hair drier with the handle broken away; Y Figure 3Ais a front view of the hair drier with the protecting shield removed; e

Figure i is aiwlring diagram showing the control circuit kfor the motor and heater.

Referring now in detail to the drawings the hair drier consists'of a motor 5, the casing Aof which isopen at bothjends as shown at 6 and 7 so that air may circulate through the motor.

A suitable bearing at 8 is provided for one end of the motor shaft which may be oiled in the conventional manner. v Y

The bearing at the -o posite end ofthe motor shaft as at 9 has tllie shaft 10 projecting completely therethrou h and carrying at its outer end the fan 11 w ich is secured in position in any suitable manner such as, for irlstance, by the set screw'12. The shaft 10-V is preferab made with a bore 13 therein extending into the bearing *9 and provided withradial openings suchas shown at 14 so that bearing 9Amay be oiled from the end of the shaft 10. AThe purpose of this is to permit STERLING, unmors, assIGNon 'ro'wann currar. ooaronarIoN.- or

the provision of a shield 15 consisting, in this .insta-nce, of anaunular ring surrounding the bearing 9 and spaced therefrom. This ring 15 is'secured by screws to the face of the motor casing and carries radially projecting mounting members 16 .which are secured thereon as shown by. having lugs projecting through slots in the shield 15 and bentV over as shown at 17 in. Figures 1 and 3. These radially projecting members 16 carry suitable insulating sheets 18 which insulating sheets serve as a support for the heating ele- `ment 19 which is wound round and round these members 18` and which may consist of anysuitable heating coil material. Thus it will be clear, it is believed, that when the motor is started and the fan operated with the heater also energized,` the shieldl will heat from the heater element 19. The fan will, of course, draw the air through the motor casing and between the bearing 9 and shield 15 while it is also drawing air in around the heater 19 and. heating the same.

T he heater and fan are protected by means of a suitable conical shield 20 which as shown clearly in Figure 1 decreases in size as it extends away from the motor and which is provided with a suitable reticulated enclosure` 21-shown in the present instance as an ordinary screen.

The stirrups 22, which are spaced around the motor casing, at rather close intervals,

lserve to support the shield 20 and hold-the same in proper spaced' relation with respect to the other elements of the drier. stirrups perform another function which is' also highly useful in that with their rela tively close spacing they serve to effectively prevent the current of air which is dra-Wn 1n by the fan -between the motor casing and the tubular member 2Q, from carrying any relatively large objects inside the shield;

These 7s I protect the bearing 9 from the effects of the that is, of 'paper and things of this sort which might get on the heater and cause considerable damage are prevented from en-` tering by the stirrups 22. v

The tapering of the member 20 performs a highly useful function in case'theouter end thereo becomes closed to prevent an escape ofair from the fan. People in using this typeof device sometimes set it fdown or place it against an object in such -fashion as to prevent the air from. the same passlng outwardly through the `screen 21. This causes the heated air to back up within the shield and except for the peculiar operation of this device would result in overheat- 'ing due to the heater and possibly considerable damage to the device itselfwould re,`

sult. However, the tapering of this shield 20 makes it possible for the air drawn inl by the fan to escape backwardly out of the shield around the motor casing since the fan, when the outlet is closed, acts as acentrifugal fan amd' forces the air radially outwardly and the air naturally travels toward the. greater diameter of the shield and in this m3111161' escapes. l

` accessible to and easily A Suitable handle 23 is provided fof the hair drier and is mounted as is shown in Figure lwith the cord from the current supply passing through the handle as rindi-- cated rat 24. to the motor.

`Ivhave provided a novel means for preventing the energization of the heater un f less the motor is operating so as to Withdraw the heated air therefrom and have so arranged' the control as to make it readily operated by the user of this device.'

The wiring diagram is shown in'Figure 4 where the motor 5 and the heater 19 are shown as connected in parallelism across a source of current supply with one switch 25 insertedin one of the main leads 'of the current supply so that when it is opened both the motor and heater are cut oli' and when it away is usually left on except when it is desired to' oper`ate the fan without the heater.

From the above description it is thought that the construction and advantages of this device will be clear to those skilled in this art.

parting from the scopeof the invention.

Havlng. thus described my invention what I claim as new and desire to ters Patent is:` l s hair drier"c0mpri`sing a motor having A va casing, a projecting shaft at one end of said casing, a fanmounted on said shaft and spaced from the motor casing, a heater ele.

It is aise obvious it is ldaifwed',k that various modifications may be madewithout de.

5 secure by Letment encircling said shaft between the an and `motor casing, and a tubular member mounted on said motor casing and having its free end projecting beyond said fan and closed by a reticulated member, ahandle projecting laterally from said motor casing and control switchesfor said motor and heater mounted at the end of said motor casing opposite the fan, saidl motor switch being ad jacent the handle so that it Iis operable by the thumb of the operators hand when holding the handle.

Inwltness whereof., I hereunto subscribe my lname this 3rd' day of Sept: A. D., 1929. LEO J. WAHL. I

Y is` closedthe motor is energized and current connected toa secondswitch 26 for control- 'ling the heater. Now by closing the switch Y 25 the motor may -be operated independently of the heater to drive the fan when the heater is not wanted. `When the heater is also used it is only necessary to close the switch vlnain motor switch is placed nearest the handle so as to be easily operable by the thumb of the operator while the'handle is held in his hand. The heater switch' being farther lunilu 

